Are these red flags for a startup? I have an interview next week with a startup. I’ve worked at startups before but in later stages. Here are a few things I am worried about:

-my salary should be $100k at the higher end but it’s offering closer to $150k. I’m in nyc but still that’s REAL high
-startup founded in 2011. It seems it either launched in March or is launching March 2019. Have to confirm that.
-founder has had a bunch of other startups before, which is normally a good sign, but two of the sites I checked are dead
-seed rounding is $6 million (2010, 2012, 2014)