Oh you are still a young-un. There are advantages to getting older.

I turn 41 on the 9th of this month LOL

YOUTH is the training period for TRUE adulthood. NOW is the time when you discover that you are NOT just a body...you are SO much more! Discover what that IS!!!

40 is still young.. you worry for nothing

Im older than that and still having fun. Why bother worrying about something you can't change?

It's just a number. Nothing more.

Some folk think you have to have achieved xyz before you hit 40. It's nonsense.

From experience, the only thing I would say is watch your alcohol; sugar and salt intake.
Other substances too i suspect but these are the ones that might start to mess with your blood pressure or glucose levels and lead you down medical paths that will give you a headache (metaphorically speaking) later.

Enjoy life.
You'll never be this young again

Celebrate your birthday and move on. There is nothing wrong with 40. This November I will be 65.

It's a time of reckoning - A fool at forty is a fool forever.