I got my Two wheeler driving license in Feb, 2004. I merged the two wheeler license with the car driving license. Because of this, I lost 5 years validity in my car driving license as they kept the expiry date of the Two wheeler license( Feb 2024 instead of Mar 2029 as new license has 20 years validity). I didn’t know about this earlier; even the Driving School staff didn’t warn me about this. As I have 15 years validity now, this is not a big issue. But, this would have been a problem, had I got my Two wheeler license 10-15 years back.