29 years old, $33k, 2.5 years in. One of the best pieces of advice I got from another fed was to start with the biggest TSP contribution I thought I could handle, then increase it proportionally every time I got a step increase, promotion, or cost of living increase.
By year 2, I was maxing my TSP. I already have planned that with my next step increase, I'll max my HSA contributions (currently about $75/paycheck). Using TSP, HSA contributions, and automatic savings allotments, I've kept my net paychecks the same or smaller than when I first started, even though my gross pay has increased by about 20%. This has been key to avoiding lifestyle inflation, since I don't really feel like I'm making more money.
I'm hoping to retire early far before my MRA of 57, but the TSP can just sit there and grow until I take a deferred retirement.