How old is Peach Mario? She is around 24 to 25 years of age, and so is Mario.
How can I find Peach Mario Odyssey? She can be found shopping near Crazy Cap Store, in the Lost Kingdom. You can warp to the Rocky Mountain Summit and she should be waiting there for you.
How can you get Peach Mario Kart Tour? If you have the Mario Kart Tour Gold Pass subscription, and have received enough Grand Stars you will also receive a Baby Peach, Daytripper Kart and other items like Cape Mario Hanafuda Gliders and gifts for the tour.