Sure, why not. It also sounds lie that in 15 years ,you haven't had any electrical problems. As long as the fuses are replaced with the proper size fuses they are as safe if not safer than breakers.Your in wall wiring is probably not up to current codes but that dosent matter, you only have to upgrade when you do renovations. Your home purchaser and their inspector will check out the wiring and potential shortcomings,but you are not required to upgrade as long as whatever was done was to code,and inspected by the local inspector, at the time.

BCElect -- Thank you very much. I wasn't sure, we've never had any electrical problems (that I'm aware of). Hopefully it'll be one less thing to worry about!

Thanks again!

It is possible that potential buyer will want the fuse box replaced. It is not required as far as I know. If they insist on it as condition of sale you can have it changed then, discount the price or tell them take it as is or leave it.