When it comes to golf clubs, newer models are always a great value for money, as long as they are in good condition and fit you well. However, if you do your research and get advice from an experienced friend or a knowledgeable salesperson, used clubs can be a great option too. Contrary to popular belief, there is no evidence that golf clubs deteriorate over time. As long as they are well-maintained, they can last a lifetime.
If you want to have your irons reconditioned, it is best to go through the original manufacturer if possible. They will be able to restore the clubs and conduct tests to make sure they are still functioning properly. Most listings will include detailed pictures of the clubs so you can assess their condition, and buyers can ask the seller questions publicly or privately. When it comes to deciding whether you need to replace your clubs, the first thing to do is ignore the marketing hype from golf club manufacturers.
This doesn't mean that some newer clubs won't give you a few extra yards, be easier to hit, or provide more spin. But I have always been wary of buying new clubs too. Clubs used in certain conditions (e.g. sand, roads, areas with heavy debris) will likely wear out faster than others.
So, if you take even basic care of your clubs - including wiping them down with a towel from time to time - they should last at least 10 years, if not longer. If your performance suddenly drops and your swing hasn't changed, it could be something wrong with the clubs themselves. While public markets like eBay require some caution (although they can also offer great deals), there are several reputable dealers who specialize in used golf clubs. For example, I recently upgraded my driver and 3 woods but kept my irons because they were still big clubs at the time and nothing has changed in the last 4 years.
Sure, the Ping G425 will be more forgiving and maybe a little longer, but that doesn't mean I need to replace my entire set. It's important to consider how often you should replace each type of club rather than replacing your entire set at once. For more expensive purchases, financing is available and some dealers will even allow you to trade in your old clubs. If pricing is a problem then maybe consider used golf clubs instead of purchasing new clubs.