Biggest age gap you've dated/mated across?

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6 years for me.

I've had three intimate relationships in my life; my first GF was 26 and I was 23. My second GF was 19 and I was 25. This year I had a 3-month-long casual relationship with a 24 year old, I'm now 30.

Funnily, the 3 year gap felt like a bigger deal; she was a lot more experienced than me not just in romance/sex but in life in general, so it was a significant factor in our relationship dynamic. With the other two, despite the gap being twice as big, we were closer in terms of experience and maturity so it felt more like we were the same age even though we weren't.