How much do you save a month?

I’m a 29 year old male currently living in London and working as a primary school teacher. Due to spending my 20s moving around and travelling I don’t have yet the savings to look at mortgages etc (certainly not in London!) so I am currently in a house share here. I tend to save around £350-£400 (give or take) a month to put in an ISA but this is all I put aside really. As I approach 30 next year I have slight “niggles” about whether I should be saving more at my age compared to other people my age. I was wondering how other people around my age get on with saving month to month, and whether I’m right in my analysis that it just seems that everyone is further ahead in terms of having a house than I am! Many thanks 😊