Do you mean the Simdex, which only displays 45 values? That is correct. The Simdex shows level by level what you can achieve in the game. The last new buildable location is unlocked at level 45: “Day Spa”. You can still level up until level 65, but there’s nothing new to unlock.
In addition to my above post: The part “but there’s nothing new to unlock.” is a bit confusing. Of course there are plenty of items to unlock past level 45. But right now there are no new quests, discovery quests and locations that require a higher level.
