You want us to list the "pros" and "cons" of someone at the age of 20 dating someone 28 when we have no idea about the circumstances and who the involved people are, and what they're like?
Without having more info i can't give you the best answer, I think with any age gap it only becomes an issue if your plans in life don't match up well.
An 8 year age gap in a relationship?!! Oh my God, that's disgusting!! Quick, let's put them in the stocks in the middle of the town square and throw stones at them!!! 😉
I think there are better sources than on TSR on the internet, where you can see the experiences of people who've actually been in that kind of situation before, and weigh up the pros and cons there. Just some advice.
well my new relationship which started from an FWB relationship has a 13 year age gap but you need far more scenario to go on but if you plans are similar then it should work