冗談のつもり the grammatical explanation


Since plain form words can attach to つもり, we can just attach the i-adjective
若い to it as is.

When our plain form word is a NOUN, we'll add a の after it. And for na-
adjectives, we add a な after them. For example, later we'll see:

> 冗談{じょうだん}のつもり

in this grammar rule. We attach the つもり with the plain form
(noun,adjective,verb). Is this つもり acting as a noun, because when its attached
with an adjective, we place a な in between them, and with noun の.




You asked a [very similar
question](https://japanese.stackexchange.com/q/69446/5010) several days ago.
This つもり is another 形式名詞. If you _really_ want a meaning as a noun, it would
be something like "intention", "plan", "assumption" or "belief". But つもり is
usually translated into English without using these nouns.

