There's a plethora of different glidepaths within the target date fund (TDF) industry. Issuers create the path of their choosing based on many different factors. Along with this, issuers also have the right to change the glidepath whenever they want. These changes can be wholesale glidepath changes or more fringe-type changes. While some quarters see no changes within the industry, in 1Q21 there were a handful, possibly corresponding with year-end reviews by the individual issuers.