In the nicest way to Anon, it may not be paedophilic, but 27 dating 20 is still sus as fuck.
Sure, the older you are the less the age gap matters - like nobody would look at an 80 year old weirdly for dating a 70 year old.
... but at 20 years old, a 7 year age gap is 1/3 of their lifespan apart. That's a fucking lot!