Although people often spend the rest of their lives with someone who is in their age bracket, there has been no rule laid down that enforces that. Nor is there any rule that states that the husband must be older than the wive.

When people spend the rest of their lives with partners of the same age bracket, it is simply because they are at a similar stage in life. Thus, are more likely to have shared interests and they will often mix in the same social circles and this gives them the opportunity to meet.

Hence, of course it is common for couples to be in the same age bracket, not all couples are in similar age grades and for some people, a large age gap works well.

There are numerous couples out there who have a large age difference between them that the society doesn't recognize. This is because they are everyday couples compared to some celebrity couples who have similar age differences. The media often make a story-line out of a celebrity couple who have a big age gap, as was seeing in the case of Sen. Ned Nwoko and Regina Daniels.

Lisa Bonet and Jason Mamoa (married in 2007)
Age Gap: 18 years
According to the 'Aqua Man', Jason Mamoa, his affection for his wife, Lisa began when he saw on on TV when he was just 8 years of age, and 18 years later, his dream came true. If you would ask me, that's a long time coming.

According to Jason, "Ever since I was 8 years old and I saw her on the TV I was like , 'Mammy, I want that one.
I was like, I'm gong to get you for the rest of my life, and I'm going to get you.' I'm a full fledged stalker. I didn't tell her that until we had two babies, otherwise it would have been creepy and weird.
I've always wanted to meet her. She was a queen, always."

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So he's 26? Didn't know.