What's the biggest age gap you'd consider acceptable while dating someone?

Elly • Photographer. Artist.
I started talking to this guy who is 5 years older than me.  I'm 23 and he's 28.  We haven't been on a date or anything, but it got me thinking about age gaps and what may be acceptable to others.  I think 5 years is okay, probably the biggest I'd go.  But what do you think?

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