Now that spring is here, you are unlikely to get any frost or ice on your driveway. However, it may have had a rough winter and now is a good time to check the state of it closely.
While any significant cracks or uneven areas could be a sign that it needs relaying or at least major repairs, it may simply be that it needs a significant clean-up to make it look as good as new.
A few buckets of soap and water and a good brushing might shift off accumulated dirt, but if you have lichen or moss growing on it, you may find power washing is the only way to get the drive looking pristine again.
Lichen is a particularly tough entity. It might not actually be able to reverse ageing (unlike in the John Wyndham novel Trouble with Lichen), but it is very durable. It is not one organism but a symbiosis of algae and fungi. It can live in all kinds of environments and has even been shown to be able to survive in space, so your driveway is not exactly a hostile place for it.
This being the case, it is fair to say that lichen will not budge easily. Power washing, however, can soon shift them, as well as other growths like moss.
Moss can be a very attractive kind of plant in the garden or the wild, but on a driveway, it can cause a lot of damage. It retains water, which leads to freeze-thaw in winter and its roots can also penetrate a surface and lead to cracking. This means that, over time, it can damage a solid surface.
For these reasons, power-washing your driveway to shift moss and lichen is not just an exercise in making it look cleaner; it can also help maintain the surface and enable it to last for much longer.