According to the syllabus, boundary value analysis is a technique that tests the values on and near the boundaries of an equivalence partition. The three-point boundary values are the minimum, just below the minimum, and just above the minimum for the lower boundary, and the maximum, just below the maximum, and just above the maximum for the upper boundary. The answer A is correct because it contains the three-point boundary values for both the lower and upper boundaries of the age range. The other answers are incorrect because they either miss some of the boundary values or include values that are too far from the boundaries.
References: Certified Tester Foundation Level Syllabus, Section 4.2.2, page 41.

Testers should be involved in reviewing a UAT specification as soon as the UAT specification has been drafted1. UAT stands for user acceptance testing, which is a type of testing that verifies that the software product meets the acceptance criteria and expectations of the end users or customers1. A UAT specification is a document that defines the scope, objectives, approach, and criteria for UAT1. Testers should be involved in reviewing a UAT specification as soon as the UAT specification has been drafted, as this can help to ensure that the UAT specification is clear, complete, consistent, testable, and aligned with the user requirements1. Testers can also provide feedback and suggestions to improve the UAT specification and avoid potential issues or conflicts during UAT execution1. Therefore, testers should be involved in reviewing a UAT specification as soon as the UAT specification has been drafted.

Explanation
A role of a formal review is B. Moderator. A formal review is a type of static technique that involves a structured process of examining code or other software artifacts by a team of reviewers who follow predefined roles and rules. A formal review has four main phases: planning, preparation, meeting, and follow-up. A formal review has five main roles: author (the person who created the code or other software artifact under review), moderator (the person who leads and facilitates the review process), reviewer (the person who examines the code or other software artifact under review and provides feedback), scribe (the person who records the issues and outcomes of the review meeting), and manager (the person who monitors and controls the review process). A moderator is a key role in a formal review because he or she is responsible for planning, organizing, conducting, and reporting the review activities and ensuring that the review objectives are met. A detailed explanation of formal reviews can be found in [A Study Guide to the ISTQB Foundation Level 2018 Syllabus], pages 35-37.