How to extract specific information from raw , unstructured text using NLP and Deep Learning?
You can create your own named-entity recognition through a pre-trained model like Spacy. https://spacy.io/usage/linguistic-features#section-named-entities

these keywords in your example should be considered as an age entity

 above 21 years
 65 years or less


try to play its linguistic features to get what you need.
Hope this helps.