With proper care, vegetable tanned leather can last many decades, it will only become more valuable and unique the longer you have it, most veg tanned leather does not come per-treated with oils and waxes. The fibres will react to water by stiffening and shrinking. Keep veg tanned leather away from water for at least the first month or so of use, to allow the leather fibres time to soften and absorb oils to increase its natural water resistance.
Additionally vegetable tanned leather is sensitive to high heat and can crack if heated to extreme temperatures, so do not use a blow dryer or heat gun on the leather, and do not store the leather in an excessively hot area.
Every few months we recommend applying a little leather balm to the leather and rubbing it in with a soft lint-free cloth and your fingers. A little goes a long way, work it into the leather with soft circles. This will nourish the leather and restore its luster as well as replace essential oils and waxes to keep it flexible and resilient.
Once a year we recommend a full cleaning of the leather using leather oil & cleaner kit to remove any accumulated dirt, deeply refresh it, and fully restore the leather to its natural beauty.