Abdula i'm sure we can both agree Tsunade is still alive, so it really doesn't matter who's born after her but before her. And i did count 2 extra generations, 1 was her father obviously, making it 85 total then as i said, the first was atleast in his 20's when he founded the village, so instead of that making the village older, it makes it younger. So instead of adding another 35, 15 should be enough.

And another way of getting the rough age:
Appearantly the 3rd was 69 when he died, and when we see a young sarutobi standing with the 1st and 2nd those 2 don't look insanely old. Even if you say the 1st is 56 that makes a total time of 125 years, and that was when the first was born, not when the village was founded. That not even being close to your 175, i can imagine a lil bit of difference but 50 years + founding age is not a lil gap.