A possible justification for at least some of these dating anomalies can be found in the audio adventure "The Legacy of Time: The Split Infinitive", when a temporal anomaly results in the 1960s and 1970s becoming briefly linked when a flawed time travel experiment essentially splits an individual between these eras. When the crisis concludes after the Seventh Doctor brings the two aspects together, he notes that the resulting temporal explosion will cause a range of minor anomalies to anyone in this era who has dealt with time travel, reflecting that this explains how someone who was working in the eighties could have retired in the seventies.