I personally like the sayings and the graphics on your site, but it does lack a certain 'pop' that makes people want to buy the shirt. You really need to get some models or friends wearing your gear. For example, for your 'Retired' shirt have an older relative or friend wear that shirt. Spice up the website a bit and I think you'll at least give people a reason to keep browsing through your site. Also, do you have a site stastics analysis where it shows you what pages people are looking at, i.e. do you see that your customers or browsers are spending only a few seconds on a page as opposed to a few minutes on another? If you do, come up with marketing strategies to get them to click on the next page. The longer they stay on the site the better you have a chance of making a sale.