Nikon D5100 viewfinder problem?

I have a question about my Nikon D5100. The camera works fine but it has one issue ( it might be me though). The view finder on my D5100 is a little out of focus. I've tried to adjust the focus on it but it doesn't seem to help. Now the funny thing is that for six years I have shot with my trusty old Nikon D50. The view finder on that camera is bright and very sharp. I can manually focus on subjects and tell if they are in focus or not just by looking though the view finder on my D50 I don't even have to look at the confirmation dot. On my D5100 however I have to basically rely on the focus confirmation dot. It there a problem with my D5100's view finder? Has anyone else had a similar issue with there D5100?

Added (1). Hey thanks for your response. I'm actually near sighted. I usually shoot with out my glasses. The D50 was actually the base model 6 years ago. I guess by today's standards it would be in the same range as the D3100. I guess I'll take a trip down to my local camera store and check out the D5100 they have on display to see if there's any difference.

Are you near or fear sighted? If so, do you still have the problem when you have your glasses on? If no, then the viewfinder doesn't have a big enough range of correction for the eyes and you need to buy an additional eyepiece that will help it get to the right amount of correction. The D50 must have worked because it has a big enough range to correct the eyes or the eyes got more fear/near sighted. Dxxs are one class higher than the D5xxx so a larger range should be in the D50.

If that's not the case, there's something wrong with it.

I know I'm going to have an issue in a few years. I cranked the viewfinder's focus as far as it can go and it's perfect for he moment. But, in a year or so, my eyes will get worse and I'll have to either use contacts, uncomfortably use my glasses with the viewfinder, use live mode, or buy an eyepiece to increase the range for my near-sightedness.