Life insurance companies take two things into consideration before they insure you. They two things are your age and your health and these determine how much you get and how much it will cost you. If you're older or drink alcohol you'll probably pay more money for your policy. However you can actually get knocked back if you're not in the best position.
It is safe to say that the younger you are the healthier you are and this means your policy will be cheaper. You'll also find the process is much cheaper and you probably won't need to go for a medical examination either. Getting a policy at this age will probably mean you'll go through a simpler process and get the best rates possible but even still theres probably a couple of things you should take into consideration before you set on getting your policy.
Life insurance is probably the last thing you think about in your twenties and you probably don't think you need it but there are some good benefits of getting covered at this age. You're much less of a risk to an insurer so getting it now means better rates than when you're in your sixties.
If you've just been married, have children or have a mortgage you're probably in your best interest of looking into it now. Life insurance with critical illness cover can help your partner pay for your mortgage or house payments if you're ill. If you're unable to pay for the household bills due to being ill you might get yourself into a bit of an unwanted situation.
You should note though is that life insurance isn't a single purchase you've got to make sure your coverage is suitable for your needs. You can always revisit your policy though.
If you need any advice on life insurance check out Hello life insurance and speak to the professionals.