How old is too old for a promise ring?

My bf of 2 years gave me a promise ring but I was expecting an engagement ring. I know I shouldn’t have been expecting but we talk about marriage a lot and we are currently saving for a house in the spring. I am 28 and he is 31. I’m not ungrateful I love it but it dawned on me that I also have not heard of anyone our age getting a promise ring and thought maybe it was a red flag 🚩. So my question is how old is too old for a promise ring?

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