All kinds of people get commissioned later in life. The needs of the Service drive all. Upper age limits and waivers can easily be changed.
We can either believe he has a true desire to serve, or tinge our view with a bit of cynicism, and figure he’s checking a block to show he’s served and will one day be a veteran. As long as he performs his duties in an acceptable manner, lives up to the standards expected of an officer, I am fine, though a bit bemused, by it. I always wonder what his new CO will think in these cases...