8. A computer program product, the computer program product comprising: one or more computer readable storage media and program instructions stored on the one or more computer readable storage media, the program instructions comprising: program instructions to authenticate an identity of a user; program instructions to retrieve a user profile that corresponds to the identity of the user, wherein the user profile contains unique information relating to at least one of the user's age, user's interests, user's location, or user's preference information, and the user profile contains unique information relating to the user's comprehension abilities and information relating to a user engagement level; program instructions to analyze preferences of a user of a computer system, within the user profile, to identify a set of customization rules; program instructions to analyze one or more portions of textual content requested by the user to identify one or more textual elements for customization, wherein the textual content is a news article, and the textual elements for customization are non-technical, advanced-level words that are to be displayed in a predetermined language; program instructions to monitor, in real time, one or more interactions between the user and the textual content including mouth and eye movements of the user; program instructions to analyze an engagement level of the user to identify a low engagement level, wherein the low engagement level is based, at least in part on the one or more interactions between the user, the textual content and a camera interface; and program instructions to, responsive to identifying the low engagement level of the user, customize, simultaneously with the real time monitoring, the one or more portions of the textual content based, at least in part, on the set of customization rules.
8. A computer program product, the computer program product comprising: one or more computer readable storage media and program instructions stored on the one or more computer readable storage media, the program instructions comprising: program instructions to authenticate an identity of a user; program instructions to retrieve a user profile that corresponds to the identity of the user, wherein the user profile contains unique information relating to at least one of the user's age, user's interests, user's location, or user's preference information, and the user profile contains unique information relating to the user's comprehension abilities and information relating to a user engagement level; program instructions to analyze preferences of a user of a computer system, within the user profile, to identify a set of customization rules; program instructions to analyze one or more portions of textual content requested by the user to identify one or more textual elements for customization, wherein the textual content is a news article, and the textual elements for customization are non-technical, advanced-level words that are to be displayed in a predetermined language; program instructions to monitor, in real time, one or more interactions between the user and the textual content including mouth and eye movements of the user; program instructions to analyze an engagement level of the user to identify a low engagement level, wherein the low engagement level is based, at least in part on the one or more interactions between the user, the textual content and a camera interface; and program instructions to, responsive to identifying the low engagement level of the user, customize, simultaneously with the real time monitoring, the one or more portions of the textual content based, at least in part, on the set of customization rules. 9. The computer program product of claim 8 , wherein the program instructions to analyze preferences of the user of the computer system to identify the set of customization rules comprise: program instructions to generate a profile associated with the user, based, at least in part, on the identified set of customization rules at a first time; and program instructions to update the profile, based, at least in part, on an additional set of customization rules at a second time.