Something's not right here.
If he was born in 1915, there is no way he could have been in WWI, therefore he has no business wearing the WWI stripes.
Even if he was born in , say 1895, he could have served in WWI, but technically the stripes aren't quite right on a WWII uniform, but it was seen.
The other problem is that the WWII service stripe is sewn on incorrectly. It should be at a diagonal with the bottom on the left and the top at the right. This one is the opposite. It also looks like they have sewn it on with the backside of the overseas stripe facing out because the short side of the stripe should be vertical, or parallel with the sleeve.
This could be a veteran put-together, or kids playing with Dad's/Grandpa's stuff, or just about anything.