RE: Am I too old for this

When it comes to how you dress for some occasion not requiring a dress code, you're too old when either you decide you are, or when your body shows that you're too old.

When your body shows that you're too old to dress a certain way, it's usually due to health reasons.

When you decide that you're too old to dress a certain way, that's a decision you made on your own terms.

At the moment, keep going as you are. It won't be a concern for another 20 years, at least!