Tips for joining military at an older age?

So I’ve been wanting to join the military for a while but do to some family issues I had decided that at the time it would be best if I stayed and took care of that first. Now that I am comfortable and confident with leaving I’m not so sure on how to prepare, I’ve already talked to a recruiter and plan to join late spring early summer of next year. With that being said I’m in the “ older side” of people enlisting, being that I’m 28this year. I know I can do all the requirements to get in the Navy, and army. How can I keep my confidence up while having to run and work out next younger people?
I used to play basketball and had a basketball scholarship so I’m used to competition just wonder if there was anything besides that to use.
Tips for joining military at an older age?
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