If that is the case you may well consider having your fascia and soffit replaced with good quality UPVC, which not only looks better and more modern but it will last for 40-50 years, possibly more.
You have to weigh up the cost of replacing the timber against the cost of replacement with UPVC, adding in the cost of painting that you will save over the years.
So in conclusion, it is important to assess the condition of your fascia and soffit before making a decision.
If it is rotten, you will need to replace it. If it is in good condition, you can save money by repainting it rather than replacing it.
However, if you want to save money and not have to repaint regularly, replacement with UPVC is the best choice.