I have loved bikes for 70 years. Now long retired I have 24 but 6 are for the kids and grandkids when they visit. I am fortunate to have a hanger w/o a plane so plenty of room. I have to do things like keep the tires treated with Aerospace 303 or I would never wear them out but as a retired mechanical engineer with maintenance experience I love the time, it is beyond just a hobby. I take great pleasure in my time in the saddle, the care and keeping, the hours of tinkering to improve performance/pleasure.
add spice to life. Life will feel like a chore and tedious process without them. But, on the other hand, they both make you feel happy and fulfilled and accomplish specific roles in your life. Any activity can become a hobby or passion; it depends on how much time and emotional investment you are willing to make for something. A hobby can turn into a passion and vice-versa. How you want to treat an activity will dictate whether it becomes a hobby or a passion for you. If you only want to do something to relax and have fun, then it should stay as a hobby. However, if you're going to get serious and become better at doing something and plan to turn it into a career, it will be better to become a passion.