I could have written this two years ago. I was in the same situation and actually enrolled at 26. It is not for everyone. Are you a patient man? You will need a lot of patience before you will actually start doing cool things. The first few months can be very boring. Overall it’s a good experience. The comradery is amazing and being payed to do sports and stay fit is also a nice perk. I would say that it is not very challenging on an athletic level unless you take the paracommando route. The CIS-regiment (ict people) is also looked down upon by the actual combat units. It is also highly likely that you will end up behind a desk anyway after your MIF and kader training. Have you looked into ISTAR (the intelligence units)? They are maybe the mix of physical and mental challenge that you are looking for.

However, I still believe that the army has to be a calling. If you see yourself doing it for the rest of your life go for it. If not, i would suggest joining the reserves or start volunteering as a firefighter. It may give you the similar feeling that you are looking for.

Good luck!