i have a friend i met when emigrated to sydney, we had both split from our partners (and father of children) she had 2 kids with her husband, now 5 and 7.
she is 37 and he is 21, they been together a year, not spoke to her in about 6 months (i am back in uk for now) so no idea if still together but she wanted more kids and him to be there all the time but he wanted to travel and have fun and didnt like being there when kids playing up.
You can only try :)