I had a dom once that was almost 6 years or so younger than me. The only issue that came up is the lack of general life experience. I've experienced a lot in my life vs his. This might be where maturity might be an issue for some. He was very mature but did lack certian life experiences that would have made us more compatible. Guidence then became an issue. He wasn't helping me mature and grow as individual. Much as what I believe a dom/sub relationship should do....Both growing together. I wanted more than he could give, on the relationship level. So, I turned to looking for someone more my age, or a little older.

My Master now, is 7 years older and is just perfect for me. He's lead me to many personal accomplishments and triumphs. Now, that doesn't mean yours can't. I feel it just depends on where You want to go within the relationship, the people involved, etc....