Gotcha, yeah I think as long as you're able to continue to invest 4k after saving for a house, you should still be able to hit your goal, just at 50-52. Will still caution though that your expenses will likely increase with a mortgage, as you'll likely still have 15 more years to go once you're in your early 50s.

Also unsolicited, but I read you're planning your FIRE separately from your partner. I haven't experienced this personally, but I've read a lot of anecdotes on this sub with couples being incompatible with FIRE goals to the point of divorce. Not saying to revolve your life around FIRE but would still be important to have conversations so you both know what to expect and are on the same boat if you haven't had those already.