I don't think that your age will be a factor for residency acceptance. I was the same age when I started pod school, and didn't find it to be a problem for residency acceptance. However, I would consider other variables such as family and financial. If you have family, this will be a significant period of time that you could otherwise be earning money that you will miss out on. 7 years of earnings and putting money into your retirement account. Also, consider starting salaries for today's graduates. I know that some start at $150k, but keep in mind that the low range is starting at $60k. Some new graduates find that their first job is less than ideal, and may face employers that "eat their young," which may cause you to have to change jobs and it could be a slow first few years. I'm not saying its going to happen to you, but it has happened to a fair number of young attendings that I have talked to.
Even if you do start at the higher end of pay, consider what will be left over after taxes and loan repayment. Consider this if you start at the low end, around $60k. Unless you have some assets to defray the costs of school and loan interest costs, the numbers for the first several years after residency can be sobering. Personally, I had some assets and also took a military scholarship, thus reducing a large part of the financial risk of doing this at an older age. Also, my family was on board with the plan. If you do have family, consider the travel involved in the last year of pod school and the extensive hours of study and work required in school and residency.
Don't mean to sound gloom and doom, but there are some realities that an older applicant should consider before jumping in. I still think its a wonderful profession and has many upsides. You will have job security, a rewarding career, the priviledge of performing surgery and practicing medicine, and the chance to pursue your dream if this is what you really want. Just crunch the numbers before you do it.