There is no set amount someone should have saved at this age because everyone's circumstances are different. Percentage targets are useless because they don't take into account the fact that there are fixed costs of living and that has to be paid regardless.
By the age of 30 I had completed many (8!) years at university and had completed my first 'real' job and had nothing saved whatsoever - just paying off student debt. I also had a mortgage by this point and so owed many more thousands, my income really only kept me afloat. I could afford nothing beyond the mortgage and bills. I could not afford a mac either! Life 100% savings 0%
However by not taking out anymore debt for anything at all and living sensibly and overpaying significantly on my mortgage, I now have a six figure sum saved up and also own 40% of my third home. In fact I could pay off the other 60% if I wanted! This is not too bad a position and I am not 40 yet. There is no secret to this - work & earn, pay off debt aggressively, don't take on any more debt (except mortgage), don't buy what you can't afford, and don't use friends & neighbours as a benchmark for how you ought to live (they usually can't afford it either!). I can now afford to buy macs thankfully ;-) Life 50% Toys 10% Savings 40% roughly
Essentially I think the best position to be in when 30 is to be starting lifelong finance planning - starting pension planning and saving if possible. It can feel a bit pointless at this point, but remember, 1) compound interest, 2) your salary will probably increase, 3) pay off debt aggressively, don't take out more.
good luck with saving up! And.