Given that his age is almost certainly the reason he doesn't like birthdays it's impossible to render comment without mentioning it. It's just a fact that once someone hits about 30 they don't want to be constantly reminded that each year brings them closer to mortality. But you can “celebrate” without reminding him that he's 365 days closer to death. Go for pleasant distractions and don't lean into the “happy birthday” elements of the day. Make a special meal or offer to take him out somewhere. It doesn't have to be heavy on birthday elements. Just try to make the day fun for him.
You mean your ex-wife.
Given that his age is almost certainly the reason he doesn't like birthdays it's impossible to render comment without mentioning it. It's just a fact that once someone hits about 30 they don't want to be constantly reminded that each year brings them closer to mortality. But you can “celebrate” without reminding him that he's 365 days closer to death. Go for pleasant distractions and don't lean into the “happy birthday” elements of the day. Make a special meal or offer to take him out somewhere. It doesn't have to be heavy on birthday elements. Just try to make the day fun for him.