From 1998 to 2023, there are a total of 25 years. To calculate this, subtract the starting year (1998) from the ending year (2023). This will give you the difference in years, which in this case is 25. It is important to note that when counting the number of years between two dates, you include both the starting and ending years in your count.
So, in conclusion, there are 25 years between 1998 and 2023.