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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 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.
