Do yYou tThink yYou lLook yYour aAge? Do You Think You Look Your Age?

However, the bottom linekey consideration is not only looking younger, but also being fresh inside. However, the key consideration is not only looking younger, but also being fresh inside.

bottom line = usually, people only say this after thoroughly talking about 2 or more factors related to the topic (i.e. looking one's age), and often it involves comparing facts or opinions, so it feels a bit out of place here

However, ithe bottom line is not only looking younger, but also being fresh insider. However, it is not only looking younger, but also being fresher.

You set no precedent beforehand to justify using the "bottom line" . also both adjectives must be the same tense and form ( er )

However, the bottom limportant thineg is not only looking younger, but also being fresh inside. However, the important thing is not only looking younger, but also being fresh inside.

I 100% agree.

So I would always like toI will always be curious and honest with myself. I will always be curious and honest with myself.

Your tense is future not past.

So I would always likewant to be curious and honest with myself. So I always want to be curious and honest with myself.

CleanlinessBeing clean is also important, though. Being clean is also important, though.

Something present or future tension is needed here.