Based off my relationship which is around the 7 year mark now having met in my mid-20s, married with cats, buying a house next year?
It depends so much what you want from life, though. Do you (as a couple) want to have children? Do you want to buy a home? Do you want to be married, in general and to each other? Do you have careers which only really hit their stride in your 30s and want to focus on those? If you want children, do you want to travel, be married, own a house first? Do either of you have existing children which might slow the start of your relationship down a bit?
Depending on what you both want from the relationship the answer could be so different.
You could have met at 27, knowing you both wanted kids before your early 30s, and have had a short engagement, a wedding 3 years in and the second baby on the way by 7 years in, and that would be the perfect timeline if that's what you both wanted.
Or you could have met at 27, both be sorting your careers out, move in together after 3 years long distance due to said careers, spend some time travelling, know you don't want children but do want to be married, but want buy a house first so you do that after 18 months living together, then get engaged 6 months after that, then be saving for your house deposit 7 years in. And be equally delighted because you're both in agreement.
I suspect why you're asking is either:
- That one of you thinks you should be 'further along' in the relationship than the other and has a mental timeline of the order or speed that things should happen which the other doesn't necessarily agree with/want. This needs talking about - if nothing else, after 7 years you can't honestly set out your expectations, wants and needs for your relationship and set boundaries there's a problem. If you want e.g. to be married and they've been promising for years and it doesn't happen you need to decide whether or not they're telling the truth and whether you're willing to compromise on that or leave, for example.
- That you're comparing yourself to other couples and feeling lacking despite being happy, which is bollocks. Comparison is the thief of joy and if you're happy it doesn't matter whether your biggest milestone is having split the cost of a National Trust membership or having had your third baby, it's nobody else's relationship.