Tons of "stuff" is just that IMO - "stuff". And all that stuff (and all the effort expended to acquire and manage it) can easily become a HUGE ball and chain, keeping you trapped both literally and financially and much less free to experience life. I remember a quote that went something like this (paraphrasing): "Things ride man as a man rides an animal". Not all that profound, I admit, but you get the gist.
Purchasing and keeping only what you really use, need and want, versus habitually/compulsively accumulating, accumulating, accumulating (on purpose or not), is the way to go without a doubt, I believe. At the very least, a dedication to regularly scheduled "house cleanings" are a good start. Moderation in all things; quality versus quantity.
I think you've realized and are acting on something that you have recognized as being trivial, superfluous and basically anti-life. And as another poster said, it's extremely rare to find/have a woman who is willing to live a more spartan life, possessions-wise, on a long-term basis. You've got nothing to lose and a lot to gain, and if later on the two of you come to the conclusion that you've made the "wrong" decision for yourselves and want to reverse course - not to worry - that can always be done.
Good luck and enjoy!
Rick
P.S. And, don't allow yourself to get hung up on the societal definitions and "rules" of age. It's all BS, unless you allow yourself to believe the cultural brainwash. To thine ownself be true. 30 (or 90, for that matter) is what you make of it, in the psychological realm and largely in the physical realm, as well.