Before going to an trip you should check tyre pressure if it is below or above manufacturer specification. This is a job that can be done by yourselves or it can be made by specialist (vulkanizer). Specialists will also tell you what would be general condition of your tires. There shouldn’t be any deformations on it and there should not be older more than 10 years.
In general every tire after five years of exploitation is ready to be replaced. There is a small mark on tire named DOT which represents week and year of tire manufacture. For example if you see mark DOT 4015 it means that this tire is produced in week 40 in year 2015.