As someone who grew up in an incredibly abusive household, hearing this all the time as a kid did my mental health no favors.
Honestly my life has been pretty stellar in my mid to late 20s. Hopefully the trajectory continues because if so my 30s are going to be pretty awesome too.
Being told this is the "best part of my life" when I was young was the primary driving factor for my increasing anxiety. Just felt like if I wasn't staying at the top, then I would only move downwards in life.