Nope, no sarcasm. My comment was directed at the line in the OP:
45, so old for mustachians but younger than anyone in my personal peer group
and I was saying that 45 is quite young to ER.
OP then made a joke about me being patronizing, which SIS missed, but Eric got, and continued the joke (and I gota chuckle out of it, and responded with "my bad").
I don't know if it was all a giant woosh over morning owl's head, or if they got it and are just quite subtle.
Either way, no harm intended.
Having enough to retire on your own savings (or pension, or whatever you've earned) at ANY age is an accomplishment. Saving up 25x your spending is awesome, even if you're 80 years old. Being able to do it two decades before the traditional age 65 retirement.. super badass. :)